What name is given to the most common phenotype in a natural population?
answer
wild type
The most common phenotype is the wild type
question
A white-eyed female Drosophila is crossed with a red-eyed male Drosophila. Which statement below correctly describes the results?
answer
None of the females will have white eyes.
All of the females will have red eyes because they will inherit the dominant red-eye allele from their male parent.
question
What can we observe in order to visualize Mendel's Law of Segregation?
answer
homologous chromosomes separating during meiosis I
Homologous chromosomes each carry an allele for every gene. Those alleles may be the same or different, but they are segregated during meiosis I and distributed to each gamete.
question
In humans, what determines the sex of offspring and why?
answer
The male gamete determines sex because each male gamete can contribute either an X or a Y chromosome.
In humans, the male produces both X- and Y-bearing sperm, whereas females only produce X-bearing eggs.
question
Who conducted the X-ray diffraction studies that were key to the discovery of the structure of DNA?
answer
Franklin
Rosalind Franklin conducted these X-ray diffraction studies of DNA.
question
In the Hershey and Chase experiment that helped confirm that DNA, not protein, was the hereditary material, what was the key finding?
answer
Radioactively labeled phosphorus was present inside the infected bacteria.
When the bacteria had been infected with T2 phage whose DNA was tagged with radioactive phosphorus, the pellet of mainly bacterial material contained most of the radioactivity, indicating that the labeled phage DNA had entered the cells.
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